Pipe-cutter.



H. E. STRATTON.

PIPE CUTTER.

APPLICATION FILED DEC.30. I915.

Patented Dec. 5, 1916.

HARPER E. STRATTON, OF EMPIRE, OHIO.

' PIPE-CUTTER.

Specification of Letters Patent.

Patented Dec. 5, 1916.

Application filed. December 30, 1915. Serial No. 69,304.

To all whom it may concern:

Be it known that I, HARPER E. STRATTON, a citizen of the United States of America, and resident of Empire, county of Jefferson, and State of Ohio, have invented certain new and useful Improvements in Pipe-Cutters, of which the following is a specification.

This invention relates to pipe cutters, and it has for its primary object to provide a pipe cutting tool embodying a pair of cutting disks which are so disposed that each performs its share of the cutting function.

It is the purpose of the present invention to provide a tool having companion disks the cutting action of which is substantially uniform or equal, the rearmost or trailing disk serving to cut into the pipe to an extent practically equal to that of the foremost disk.

A further object of the invention is to provide, in a device of the character mentioned, a pressure-applying roller which is so formed that the cuttings are not rolled back into the incision produced by the cutters.

With these and other objects in view, the invention resides in the features of construction, arrangement of parts and combinations of elements which will hereinafter be fully described, reference being had to the accompanying drawings, forming a part of this specification, in which Figure 1 is a side elevation of the invention; Fig. 2 is an enlarged side elevation of the yoke with the cutting disks mounted therein; Fig. 3 is a front view of the same; Figs. 4 and 5 are enlarged sections taken respectively on lines 44 and 5-5, Fig. 1; and Fig. 6 is an enlarged detail sec tion showing the swivel-like mounting for the adjusting screw.

Referring to said drawings, in which like designating characters distinguish like parts throughout the several views1 indicates a curved jaw having a shank 2 which carries upon its rear end a heel portion 3, said parts being preferably formed integral. Embracing the shank 2 and slidable thereon is the sleeve portion 4 of a bearing block 4 1n which is swiveled the front end of an adjusting screw or stem 5 which is threaded through the heel portion 3 and lies parallel to said shank 2. Said bearing block is adjustable with respect to the jaw 1 and has mounted in the upper front portion thereof a roller 6 designed to engage a pipe 7 interposed between it and companion cutting disksS and 9 carried in alined relation by said aw. Said cutting disks are rotatably mounted in an angular rocker or balance yoke 10 which is disposed within a suitable space provided therefor in said jaw, as in a recess or channel 11. Said balance yoke is of substantially V-shape and has its apex or angle portion pivoted to said jaw, as shown at 13. The disks 8 and 9 are mounted in the ends or terminals of the opposite arms or members of said balance yoke and project from said jaw in a rearward direction for presenting their peripheries to the pipe 7 interposed between said jaw and the roller 6. The channel 11 is of a depth suflicient to enable its side walls to extend beyond the cutting-disk journals, and also substantially cover and shield the ends of the yoke.

As is obvious, forward adjustment of the bearing block 4, accomplished by forward turning of the adjusting screw 5, acts to thrust an interposed pipe against the peripheries or cutting edges of the disks 8 and 9. The engaged disks automatically adjust themselves to seat with equal pressure against the pipe, due to the balanced charactor of their mounting, and, consequently, to cut into said pipe to a substantially identical extent. Upon rotation of the tool with respect to the pipe, the rearmost disk 9, or the disk occupying the position nearest the point of the aw, follows in the cut or groove produced by the foremost disk 8 and produces a cut equivalent to that of said foremost disk.

To prevent the roller 6 from rolling cut tings into the cut or incision, the same is provided with a peripheral groove or channel 12 which is so positioned that said incision is straddled.

lVhile the bore of the heel portion 3 through which the adjusting screw 5 is directed may be threaded in the usual manner, I prefer to have the same unthreaded and to seat a removable block 14 in a recess 15 in the front face of said heel portion, such block having a threaded bore therein in which said screw is received. Thus wear occurs in the block instead of in the heel portion. As is apparent, the block may be replaced at slight expensewhen occasion requires. The block 14 and recess 15 may be of slightly tapered forms adapting the former for assuming clove-tailed seating relation to the heel portion, as shown. Suitable means, as a set-screw 16 directed into 7 plain socket 18 in said bearing block, and

to direct a set-screw 19 into said block at right angles to said adjusting screw with its point loosely seated in said groove, as shown in Figs. 1 and 6.

Suitable stops, as pins 20, are provided in the recess or channel 11 at suitable points adjacent to the outer edges of the members of the rocker or balance yoke for limiting the extent of rocking movement of the latter.

WVhat is claimed is 1. In a pipe cutter, a recessed jaw, a V- yoke pivoted at its apex in the aw recess, a cutting disk journaled on each of the other ends of the yoke, the side walls of the recess extending over the ends of the disk-journals and nearly to the extremities of the yoke, so that they substantially cover and shield the yoke-arms from injurious impacts, a pair of pins in the recess of the jaw to engage the yoke at its opposite sides to limit the swinging movement thereof, and means to hold a pipe in engagement with said disks.

2. In a pipe cutter, a jaw having a shank and a heel, cutters borne by the jaw, said heel having a dovetailed recess opening through the front thereof, a dovetailed block removably fitted in the recess, said block and heel having registering threaded openings, a screw in said threaded openings, means operated by the screw to hold a pipe in engagement with the cutters, and means to hold the block a 'ainst movement.

3. In a pipe cutter, a jaw having a shank and a heel, cutters borne by the jaw, said heel having a recess, a block removably fitted in the recess, means to hold the block in the recess, said block and heel having registering threaded openings, a screw in said threaded openings, and means operated by the screw to hold a pipe in engagement with the cutters.

In testimony whereof, I aflix my signature in presence of subscribing witnesses.

HARPER E. STRATTON.

Witnesses GEORGE I-IArNs, W. H. NURNBERGER, F. V. FLEDGE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

